As far as I know only moderators and site admins get to pick a different community to migrate questions to.
The dialog I started seeing after becoming a moderator changed, presenting a search box with actual listing of Stack network sites we can pick from.
From my freshly made research on the subject this has already been proven to be troublesome, with many sites being overwhelmed by incoming questions rejected from other sites and becoming an easy bin for sweeping away unwanted or poorly formed questions.
I can see this being abused and quickly becoming a pass the buck game, where we shove questions away to unsuspecting target sites without much thought, potentially flooding them with off topic questions.
I speculate the list was once populated with other sites relevant for our frequent off topic reasons, but is now featuring only meta; probably because our site is specific to using Blender the 3D software package, and no other "tangentially related" topics with a valid relevant network site were deemed worthy of being permanently featured in that list.
Of course one can argue that sites like, Game Development, Stack Overflow, or even Graphic Design are sometimes relevant, but this was probably abused in the past.
This may also prove an unwelcoming experience to the inexperienced OP which unexpectedly "travels through a magic portal" and quickly finds his question migrated to a completely different "hostile world" where an innocent question gets massively downvoted on a dedicated site where beginner questions are poorly received.
Since I'm also often not that familiar with the rules and valid topics of other communities, I prefer to point the OP to other sites through comments, rather that do it automatically.